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License Agreements - Agenus (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 14, 2017
USD ($)
$ / shares
Feb. 01, 2017
USD ($)
$ / shares
shares
Feb. 28, 2017
USD ($)
item
Nov. 30, 2015
item
Jan. 31, 2015
USD ($)
item
Sep. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
License agreements                      
Long term investments               $ 222,301 $ 133,657    
Unrealized gain (loss) on long term investments               10,426 34,458 $ (44,093)  
Research and development expense               $ 2,215,942 1,154,111 1,197,957  
Agenus                      
License agreements                      
Number of program targets | item     4 3 4            
Royalty payments on future global net sales (as a percent)               15.00%      
Research and development expense               $ 0 1,500 4,600  
Agenus | Accrued and other liabilities                      
License agreements                      
Accrued and other liabilities               $ 500 1,600    
Agenus | Development, Regulatory and Commercialization Milestones | Minimum                      
License agreements                      
Royalty payments on future global net sales (as a percent)               6.00%      
Agenus | Development, Regulatory and Commercialization Milestones | Maximum                      
License agreements                      
Royalty payments on future global net sales (as a percent)               12.00%      
Additional milestone payments under the license agreement     $ 510,000                
Agenus | Development Milestones                      
License agreements                      
Upfront payment under license agreement                   5,000 $ 20,000
Agenus                      
License agreements                      
Total consideration paid         $ 60,000            
Long term investments               $ 44,700 72,300    
Ownership percentage (as a percent) 0.18%         0.07% 0.098%        
Shares divested (in shares) | shares           2.5 1.2        
Gross proceeds from sale of stock           $ 12,700 $ 4,500        
Unrealized gain (loss) on long term investments               $ 10,300 $ 30,000 (15,600)  
Agenus | Minimum                      
License agreements                      
Share price (per share) | $ / shares           $ 4.28 $ 3.57        
Agenus | Maximum                      
License agreements                      
Share price (per share) | $ / shares           $ 5.25 $ 4.21        
Agenus | Stock purchase agreement                      
License agreements                      
Total consideration paid $ 60,000                    
Purchase of common stock under Stock Purchase Agreement (in shares ) | shares   10.0                  
Purchase price of common stock   $ 60,000                  
Per share price | $ / shares $ 4.40 $ 6.00                  
Discount for lack of marketability $ 4,500                    
Fair value of shares on the issuance date $ 39,500                    
Long term investments                   $ 39,500  
Research and development expense                     $ 20,500